• 반도체디스플레이기술학회지
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• 제13권4호
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• pp.37-42
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• 2014

Stable running is a very important factor when we are building a control system. But, sometimes malfunction of the system controller is caused by several reasons. To solve these problems, some systems have prepared a backup controller. In the generality of cases, making a backup controller is no easy work. Especially, it becomes more difficult when many backup controllers have to be embodied in one system. In this paper, the multi-backup function controller which was implemented in the form of the network type distributed control system will be suggested. Also, using Arago Disk System that has a structure for inner loop control, the validity of the proposed methods will be verified.

• 반도체디스플레이기술학회지
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• 제7권1호
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• pp.17-22
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• 2008

The proposed hybrid controller consists of PID controller, feedforward controller and RLSE (Recursive Least Square Estimating) adaptive controller to compensate the force ripple that is periodic function of position in a linear motor. The modeling of force ripple is divided into the current-dependent and current-independent components. The current independent components never change as the current into the linear motor changes. On the other hand, the current-dependent components change as current varies when the velocity and load of the linear motor change. The proposed controller can compensate both force ripples. The feedforward controller compensates the current-independent components and the RLSE adaptive controller compensates the current-dependents components. We verified the performance of the controller by simulation and experiments.

• 전기전자학회논문지
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• 제9권2호
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• pp.101-107
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• 2005

본 논문에서는 전자 디스펜서(dispenser)용 제어기를 단일 칩으로 설계하였다. 전자 디스펜서는 전자부분과 기계부분으로 구성되며, 전자부분은 이력 키패드, 제어기, 디스플레이 모듈과 펌프모듈로 구성된다. 본 논문에서 설계한 제어기는 LCD 소자와 모터 펌프를 제어하며 VHDL을 이용하여 설계하였다. LCD 소자로서 WX12864AP1을 사용하였으며, 스테핑 모터로는 SPS20을 사용하였다. 이 제어기는 Altera사의 Quartus 툴을 사용하여 설계 후, Agent 2000 설계 키트와 APEX20K 소자를 사용하여 LCD 모듈과 모터모듈에 연결하여 동작 검증함으로, 동작이 원활히 이루어짐을 확인하였다. 본 논문에서는 전자 디스펜서의 제어기 설계를 통해 전자 디스펜서의 전용 칩을 ASIC으로 구현하여 바이오기술 분야의 기기에 적용할 수 있는 가능성을 제시하였다.

• 반도체디스플레이기술학회지
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• 제1권1호
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• pp.21-28
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• 2002

This paper presents a dynamic modeling and a robust PID controller design process for the wire bonder head assembly. For modeling elements, the system is divided into electrical part, magnetic part, and mechanical part. Each part is modeled using the bond graph method. The PID controller is used for high speed/high accuracy position control of the wire bonder assembly. The Taguchi method is used to obtain the more robust PID gain combinations than conventional one. This study makes use of an L18 array with three parameters varied on three levels. Results of simulations and experimental show that the designed PID controller provides a improved ratio of signal to noise and a reduced sensitivity improved to the conventional PID controller.

• 전력전자학회논문지
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• 제13권4호
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• pp.287-294
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• 2008

본 논문은 통제 시현 장치(Control data unit ; CDU), 다기능시현장치(Multi Function Display ; MFD)와 같은 항공기 디스플레이용 LED 백라이트의 광대역 휘도 제어기의 개발에 대해 기술하였다. 항공기 디스플레이 장치는 주간의 태양광 아래서 수백 fL 이상의 고 휘도에서부터 야간에 야시경(Night Vision Goggle) 착용 시 0.05fL의 최저 휘도까지 광대역의 범위에서 디스플레이가 가능해야 한다. 따라서 본 논문에서는 광대역의 조광 제어 범위 내에서의 정확한 휘도 제어를 하기 위해 광센서를 사용한 궤환 휘도 제어기를 제안하였다. 제안된 휘도 제어기는 주위 온도변화에 대해서 0.05fL에서 150fL까지 1:3000의 광대역의 조광 제어 범위에서 향상된 제어성능을 보인다. 제안된 제어 시스템의 성능은 본 논문의 실험 결과들을 통해서 검증하였다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2000년도 전력전자학술대회 논문집
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• pp.61-65
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• 2000

In this paper We have developed the high-speed controller for haptic control. The proposed controller is based on the PCI/FPGA technology which can calculate the real position and transmit the force data to device rapidly. The haptic system is composed of 6DOF force display device high-speed controller. The developed system will be used on constructing the dynamical virtual environment. To show the efficiency of our system we designed simulation program of force-reflecting. As the result of the experiment we found that the controller has much higher resolution than some other controller It is so efficient in a 1 PC-based system with 1[kHz] haptic interrupt cycle.

• 한국콘텐츠학회논문지
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• 제4권4호
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• pp.179-187
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• 2004

본 논문에서는 AMBA기반의 LCD 컨트롤러를 설계하였다. 일반적으로 LCD를 사용한 디스플레이 시스템은 고속의 데이터 액세스를 위하여 독자적인 버스 구조를 채택하고 있다. 제안한 컨트롤러는 AMBA의 데이터 포맷을 준수하며, 내부에 이미지 보간을 위한 이미지 스케일러를 내장하고 있다. 이미지 보간에는 수평방향으로 FOI(First Order Interpolation) 보간 알고리즘을 이용하고 수직 방향으로 H-형 PMED(H-Shape Pseudomedian)필터를 이용하였다. 본 컨트롤러의 모든 회로는 VHDL을 이용하여 설계하고, Xilinx FPGA를 이용하여 테스트 보드를 만들어 구현하여 LCD 패널에 직접 데이터를 출력함으로써 검증하였다.

• 반도체디스플레이기술학회지
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• 제7권2호
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• pp.55-58
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• 2008

The objective of the research is to design, manufacture and test a Mass Flow Controller(MFC) capable of measuring compressible fluid flows based on a "bucket and stop-watch"method. The basic principle is the measurement of time, where the time taken to fill and empty a bucket of known volume is measured. This method of flow measurement is a new concept when compared to a commercilized current mass flow controller. For the flow meter to be able to compete with established designs it not only must be comparable in cost and robustness, it must be very accurate and reliable as well. This device should be able to handle fluid flows in the range of 0.1ml/min to 10ml/min within an accuracy of ${\pm}$1%. A possible application for a device such as this is in electronics industry where arsenic gas is used in the production of silicon chips.

• 반도체디스플레이기술학회지
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• 제16권4호
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• pp.46-51
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• 2017

Recent controller design techniques often discretize the target system and implement a discrete controller that is digitized to match the target system. When constructing such a discrete system, it is necessary to first determine the sampling time. The smaller the sampling time is, the more advantageous it can be made similar to the original system, but the cost is a problem when realizing such a configuration as hardware. On the other hand, the longer the time, the more different the system is from the original system, and eventually the control becomes impossible. In this paper, we consider the above problem and propose a more logical approach to determine the sampling time in the discrete system and investigate the relation with the differential controller. We also apply this process to a nonlinear system called ARAGO disc and verify its validity through computer simulation.

• 반도체디스플레이기술학회지
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• 제22권4호
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• pp.148-153
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• 2023

A digital controller uses a microprocessor and is a controller implemented as a program. This method has the advantage of being more maintenance-friendly than existing analog controllers. However, it inevitably requires computation time to execute the internal program. Therefore, the digital controller uses a method of controlling the system at a certain cycle by considering this time, and this cycle is very closely related to the performance of the microprocessor used. In other words, in the case of very high performance, this control cycle can be shortened to near real time, but this may result in a disadvantage in terms of cost. In this paper, we propose a method to solve this problem by implementing two processors with slightly lower performance in a control system in a series-parallel structure. For this purpose, we will use a digital distributed control system and implement an experimental system to examine its effectiveness.